Multiquip operation manual DCA10SPX4/DCA10SPXU4 General Information

DCA10SPX4/DCA10SPXU4 — GENERAL INFORMATION

DCA-10SPX4 Whisperwatt™ Series Familiarization

Generator

The MQ Power Model DCA10SPX4 is a 8 kW generator (Figure 3) that is designed as a high quality portable (requires a trailer for transport) power source for telecom sites, lighting facilities, power tools, submersible pumps and other industrial and construction machinery.

Generator Control Panel

The “Engine Operating Panel” is provided with the following:

■Warning Lamp Unit

■Speed Control Switch

■Frequency Meter (Hz)

■AC Ammeter (Amps)

■AC Voltmeter (Volts)

■Voltage Regulator

■Ignition Switch

■Hour Meter

■3-Pole, 45 amp Main Circuit Breaker

■1-Pole, 20 amp Circuit Breaker (for GFCI)

■1-Pole, 30 amp Circuit Breaker (for L5-30R)

■1-Pole, 30 amp Circuit Breaker (for L6-30R)

■1-Pole, 45 amp Circuit Breaker (for CS6369)

■“Control Box” (located behind the Gen. Control Panel)

■Automatic Voltage Regulator

■Current Transformer

■Voltage Rectifer

■Starter Relay

Output Terminal Panel

The “Output Terminal Panel” is provided with the following:

■100V output receptacle (5-20R) GFCI, 20A

■100V output receptacle (L5-30R), 30A

■200V output receptacle(L6-30R), 30A

■100/200V output receptacle (CS6369), 45A

Open Delta Excitation System

The generator is equipped with the state of the art "Open- Delta" excitation system. The open delta system consist of an electrically independent winding wound among stationary windings of the AC output section.

There are four connections of the open delta A, B, C and D. During steady state loads, the power from the voltage regulator is supplied from the parallel connections of A to B, A to D, and C to D. These three phases of the voltage input to the voltage regulator are then rectified and are the excitation current for the exciter section.

When a heavy load, such as a motor starting or a short circuit occurs, the automatic voltage regulator (AVR) switches the configuration of the open delta to the series connection of B to C. This has the effect of adding the voltages of each phase to provide higher excitation to the exciter section and thus better voltage response during the application of heavy loads.

The connections of the AVR to the AC output windings are for sensing only. No power is required from these windings.

The open-delta design provides virtually unlimited excitation current, offering maximum motor starting capabilities. The excitation does not have a "fixed ceiling" and responds according the demands of the required load.

Engine

The DCA-10SPX4is powered by a 3 cylinder, water cooled, Kubota Model D1503-M diesel engine. This engine is designed to meet every performance requirement for the generator. Reference Table 2 for engine specifications.

In keeping with MQ Power's policy of constantly improving its products, the specifications quoted herein are subject to change without prior notice.

Electric Governor System

The electric governor system controls the RPMs of the en- gine. When the engine demand increases or decreases, the governor system regulates the frequency variation to ±.25%.

Extension Cables

When electric power is to be provided to various tools or loads at some distance from the generator, extension cords are normally used. Cables should be sized to allow for distance in length and amperage so that the voltage drop between the generator and point of use (load) is held to a minimum. Use the cable selection chart (Table 6) as a guide for selecting proper extension cable size.

PAGE 18 — DCA10SPX4/DCA10SPXU4 — OPERATION AND PARTS MANUAL — REV. #0 (08/05/09)